Gary's new single, titled "Concern", is his first music release since May of 2016, and is also the rapper's first activity since his marriage. The song contains a message telling listeners to keep "concerns" to an adequate amount and relax. Gary also expresses his affection toward his wife through romantic lyrics about finding rest in a significant other. 

Many are wondering if Gary will open up about rumors of Leessang's disbandment, after the release of his surprise single. Listen to Gary's "Concern" above!